Stare at someone’s forehead to intimidate them
We’re not advocating that intimidating someone is a good idea. However, if you feel like it, a nice place to start would be to just stare at their forehead. People find it quite upsetting because it belittles them and gives them the impression that there is dirt on them.
Regardless of your height difference from the other individual, this still works. However, exercise caution when using this approach. Even if it’s frightening, it has the potential to agitate the other person and worsen the issue.